Modulus elasticity of the graded concrete, a preliminary research M. Mirza Abdillah Pratama, B. Sri Umniati, Bunga Arumsari Mutiara Wulandari, Ay Lie Han, Buntara Sthenly Gan and Zhabrinna Zhabrinna MATEC Web Conf., 195 (2018) 01005 Published online: 22 August 2018 DOI: 10.1051/matecconf/201819501005